All-solid-state battery having high energy density and capable of stable operation

Abstract

Disclosed is an anodeless-type all-solid-state battery having a novel structure, which has high energy density and is capable of operating stably.

What is claimed is: 
     
         1 . An all-solid-state battery, comprising:
 an anode current collector layer;   a porous layer disposed on the anode current collector layer and having a porous structure including a fibrous material;   an electrolyte layer disposed on the porous layer; and   a composite cathode layer disposed on the electrolyte layer,   wherein at least a portion of a surface of the fibrous material is coated with a solid electrolyte.   
     
     
         2 . The all-solid-state battery of  claim 1 , wherein the fibrous material is interconnected in three dimensions. 
     
     
         3 . The all-solid-state battery of  claim 1 , wherein the fibrous material comprises one or more selected from the group consisting of carbon nanofiber, carbon nanotubes, and vapor-grown carbon fiber. 
     
     
         4 . The all-solid-state battery of  claim 1 , wherein the solid electrolyte has a thickness of about 0.1 μm to 20 μm. 
     
     
         5 . The all-solid-state battery of  claim 1 , wherein the solid electrolyte comprises a sulfide solid electrolyte. 
     
     
         6 . The all-solid-state battery of  claim 1 , wherein the porous layer has a thickness of about 100 μm to 500 μm. 
     
     
         7 . The all-solid-state battery of  claim 1 , wherein the porous layer has a porosity of about 10% to 80%. 
     
     
         8 . The all-solid-state battery of  claim 1 , wherein the porous layer comprises a first region, ranging to a predetermined depth from one surface of the anode current collector layer, and a second region, which is a remaining portion other than the first region. 
     
     
         9 . The all-solid-state battery of  claim 8 , wherein an amount of the solid electrolyte applied on the first region is less than an amount of the solid electrolyte applied on the second region. 
     
     
         10 . The all-solid-state battery of  claim 8 , wherein a lithium ionic conductivity of the solid electrolyte of the first region is greater than a lithium ionic conductivity of the solid electrolyte of the second region. 
     
     
         11 . The all-solid-state battery of  claim 8 , wherein an electronic conductivity of the fibrous material of the first region is greater than an electronic conductivity of the fibrous material of the second region. 
     
     
         12 . The all-solid-state battery of  claim 8 , wherein the first region comprises metal particles forming an alloy with lithium. 
     
     
         13 . The all-solid-state battery of  claim 12 , wherein the metal particles comprise one or more selected from the group consisting of lithium (Li), indium (In), gold (Au), bismuth (Bi), zinc (Zn), aluminum (Al), iron (Fe), tin (Sn), and titanium (Ti). 
     
     
         14 . A vehicle comprising an all-solid battery of  claim 1 .